Initialize parseURL and parseQueryString lazily

http/vibe/http/server.d

@@ -475,9 +475,9 @@ alias HTTPServerErrorPageHandler = void delegate(HTTPServerRequest req, HTTPServ
 */
 enum HTTPServerOption {
 	none                      = 0,
-	/// Fills the `.path` and `.queryString` fields in the request
+	/// Deprecated: Fills the `.path` and `.queryString` fields in the request
 	parseURL                  = 1<<0,
-	/// Fills the `.query` field in the request
+	/// Deprecated: Fills the `.query` field in the request
 	parseQueryString          = 1<<1 | parseURL,
 	/// Deprecated: Fills the `.form` field in the request
 	parseFormBody             = 1<<2,
@@ -800,29 +800,51 @@ final class HTTPServerRequest : HTTPRequest {
 		*/
 		TLSCertificateInformation clientCertificate;
 
-		/** The _path part of the URL.
+		private bool urlParsed;
+		private void parseURL() @safe {
+			auto url = URL.parse(requestURL);
+			_path = urlDecode(url.pathString);
+			_queryString = url.queryString;
+			_username = url.username;
+			_password = url.password;
+			urlParsed = true;
+		}
 
-			Remarks: This field is only set if HTTPServerOption.parseURL is set.
+		/** The _path part of the URL.
 		*/
-		string path;
+		ref string path() @safe {
+			if (!urlParsed)
+				parseURL;
+			return _path;
+		}
+		private string _path;
 
 		/** The user name part of the URL, if present.
-
-			Remarks: This field is only set if HTTPServerOption.parseURL is set.
 		*/
-		string username;
+		ref string username() @safe {
+			if (!urlParsed)
+				parseURL;
+			return _username;
+		}
+		private string _username;
 
 		/** The _password part of the URL, if present.
-
-			Remarks: This field is only set if HTTPServerOption.parseURL is set.
 		*/
-		string password;
+		ref string password() @safe {
+			if (!urlParsed)
+				parseURL;
+			return _password;
+		}
+		private string _password;
 
 		/** The _query string part of the URL.
-
-			Remarks: This field is only set if HTTPServerOption.parseURL is set.
 		*/
-		string queryString;
+		ref string queryString() @safe {
+			if (!urlParsed)
+				parseURL;
+			return _queryString;
+		}
+		private string _queryString;
 
 		/** Contains the list of _cookies that are stored on the client.
 
@@ -846,10 +868,16 @@ final class HTTPServerRequest : HTTPRequest {
 		/** Contains all _form fields supplied using the _query string.
 
 			The fields are stored in the same order as they are received.
-
-			Remarks: This field is only set if HTTPServerOption.parseQueryString is set.
 		*/
-		FormFields query;
+		@property ref const(FormFields) query() @safe {
+			if (_query.isNull) {
+				_query = FormFields.init;
+				parseURLEncodedForm(queryString, _query);
+			}
+
+			return _query.get;
+		}
+		Nullable!FormFields _query;
 
 		import vibe.utils.dictionarylist;
 		/** A map of general parameters for the request.
@@ -977,8 +1005,7 @@ final class HTTPServerRequest : HTTPRequest {
 		Note that the port is currently not set, so that this only works if
 		the standard port is used.
 	*/
-	@property URL fullURL()
-	const @safe {
+	@property URL fullURL() @safe {
 		URL url;
 
 		auto xfh = this.headers.get("X-Forwarded-Host");
@@ -1046,7 +1073,7 @@ final class HTTPServerRequest : HTTPRequest {
 
 		The returned string always ends with a slash.
 	*/
-	@property string rootDir() const @safe {
+	@property string rootDir() @safe {
 		if (path.length == 0) return "./";
 		auto depth = count(path[1 .. $], '/');
 		return depth == 0 ? "./" : replicate("../", depth);
@@ -2107,22 +2134,6 @@ private bool handleRequest(InterfaceProxy!Stream http_stream, TCPConnection tcp_
 			}
 		}
 
-		// URL parsing if desired
-		if (settings.options & HTTPServerOption.parseURL) {
-			auto url = URL.parse(req.requestURL);
-			req.path = urlDecode(url.pathString);
-			req.queryString = url.queryString;
-			req.username = url.username;
-			req.password = url.password;
-		}
-
-		// query string parsing if desired
-		if (settings.options & HTTPServerOption.parseQueryString) {
-			if (!(settings.options & HTTPServerOption.parseURL))
-				logWarn("Query string parsing requested but URL parsing is disabled!");
-			parseURLEncodedForm(req.queryString, req.query);
-		}
-
 		// lookup the session
 		if (settings.sessionStore) {
 			// use the first cookie that contains a valid session ID in case